hibernate4 二级缓存demo实例

hibernate4 二级缓存demo实例

hibernate4 二级缓存demo实例:作者cxl2012

hibernate使用版本是：hibernate-release-4.2.5.Final

需要的jar包：hibernate-release-4.2.5.Final\lib\required下所有jar包

ehcache  jar包：hibernate-release-4.2.5.Final\lib\optional\ehcache下所有包

junit：junit-4.10.jar和mysql-connector-java-5.1.15-bin.jar

注：hibernate 4.2.5版本ehcache缓存不依赖commons-logging-1.1.1.jar,需要的是slf4j-api-1.6.1.jar

项目结构如下

hibernate.cfg.xml

<?xmlversion='1.0'encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<propertyname="connection.driver_class">com.mysql.jdbc.Driver</property>
<propertyname="connection.url">jdbc:mysql://127.0.0.1:3306/hibernate4</property>
<propertyname="connection.username">root</property>
<propertyname="connection.password">root</property>
<!-- JDBC connection pool (use the built-in) -->
<propertyname="connection.pool_size">1</property>
<!-- SQL dialect -->
<propertyname="dialect">org.hibernate.dialect.MySQL5Dialect</property>
<!-- Enable Hibernate's automatic session context management -->
<propertyname="current_session_context_class">thread</property>
<!-- Disable the second-level cache -->
<!--<property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>
        -->
<!-- 配置二级缓存 -->
<propertyname="hibernate.cache.use_second_level_cache">true</property>
<propertyname="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>
<!-- hibernate3的二级缓存配置 -->
<!-- <property name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property> -->
<!-- 开启查询缓存 -->
<propertyname="hibernate.cache.use_query_cache">true</property>

<!-- Echo all executed SQL to stdout -->
<propertyname="show_sql">true</property>
<!-- Drop and re-create the database schema on startup -->
<propertyname="hbm2ddl.auto">update</property>
<mappingclass="com.test.pojo.User"/>
</session-factory>
</hibernate-configuration>

注意：hibernate4和hibernate3配置不一样，hibernate4是

<propertyname="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>

而hibernate3的配置是

<propertyname="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property>

此处有一个疑问是：hibernate4的官方文档中，已经把class改了，但是属性名称没有改，还是hibernate.cache.provider_class，不是上面的hibernate.cache.region.factory_class，但是写成hibernate.cache.provider_class会报下面错误

org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.spi.CacheImplementor]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:186)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:150)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:264)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1790)
    at com.test.pojo.UserTest.beforeClass(UserTest.java:28)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.hibernate.cache.NoCacheRegionFactoryAvailableException: Second-level cache is used in the application, but property hibernate.cache.region.factory_class is not given, please either disable second level cache or set correct region factory class name to property hibernate.cache.region.factory_class (and make sure the second level cache provider, hibernate-infinispan, for example, is available in the classpath).
    at org.hibernate.cache.internal.NoCachingRegionFactory.buildTimestampsRegion(NoCachingRegionFactory.java:87)
    at org.hibernate.cache.spi.UpdateTimestampsCache.<init>(UpdateTimestampsCache.java:62)
    at org.hibernate.internal.CacheImpl.<init>(CacheImpl.java:72)
    at org.hibernate.engine.spi.CacheInitiator.initiateService(CacheInitiator.java:40)
    at org.hibernate.engine.spi.CacheInitiator.initiateService(CacheInitiator.java:35)
    at org.hibernate.service.internal.SessionFactoryServiceRegistryImpl.initiateService(SessionFactoryServiceRegistryImpl.java:91)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:176)
    ... 20 more

说是hibernate.cache.region.factory_class属性没有配置，估计官方文档里没有把属性改过来。。。

ehcache.xml

<?xmlversion="1.0"encoding="UTF-8"?>
<ehcachexmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"
updateCheck="false">
    <!--
        name:cache唯一标识
        eternal：缓存是否永久有效
        maxElementsInMemory：内存中最大缓存对象数
        overflowToDisk(true,false)：缓存对象达到最大数后，将缓存写到硬盘中
        diskPersistent：硬盘持久化
        timeToIdleSeconds：缓存清除时间
        timeToLiveSeconds：缓存存活时间
        memoryStoreEvictionPolicy：缓存清空策略
        1.FIFO：first in first out 先讲先出
        2.LFU： Less Frequently Used 一直以来最少被使用的
        3.LRU：Least Recently Used  最近最少使用的
    -->
<defaultCachemaxElementsInMemory="1000"eternal="false"
timeToIdleSeconds="120"timeToLiveSeconds="120"overflowToDisk="true"/>
<cachename="userCache"eternal="false"maxElementsInMemory="1000"
overflowToDisk="false"diskPersistent="false"timeToIdleSeconds="3600"
timeToLiveSeconds="3600"memoryStoreEvictionPolicy="LFU"/>
</ehcache>

User实体类

package com.test.pojo;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;

@Entity
@Cache(usage=CacheConcurrencyStrategy.READ_WRITE)
publicclass User {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
privateint id;
private String name;
privateint age;
publicint getId() {
return id;
    }
publicvoid setId(int id) {
this.id = id;
    }
public String getName() {
return name;
    }
publicvoid setName(String name) {
this.name = name;
    }
publicint getAge() {
return age;
    }
publicvoid setAge(int age) {
this.age = age;
    }

}

UserTest测试类：

package com.test.pojo;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
import org.junit.BeforeClass;
import org.junit.Test;

publicclass UserTest {

privatestatic SessionFactory sessionFactory = null;
@BeforeClass
publicstaticvoid beforeClass() {
        Configuration configuration = new Configuration();


try {
            configuration.configure();
        } catch (HibernateException e) {
// TODO Auto-generated catch block
            e.printStackTrace();
        }


        ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
        sessionFactory = configuration.buildSessionFactory(serviceRegistry);
    }
@Test
publicvoid testEhcache() {
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        User u1 = (User) session.load(User.class, 3);
        System.out.println(u1.getName());
        session.getTransaction().commit();
        session.close();
        Session session2 = sessionFactory.openSession();

        session2.beginTransaction();
        User u2 = (User) session2.load(User.class, 3);
        System.out.println(u2.getName());
        session2.getTransaction().commit();
        session2.close();
    }
}

结果：

Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.name as name3_0_0_ from User user0_ where user0_.id=?
zhangsan
zhangsan

list二级缓存测试

package com.test.pojo;
import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
import org.junit.BeforeClass;
import org.junit.Test;

publicclass UserTest {

privatestatic SessionFactory sessionFactory = null;
@BeforeClass
publicstaticvoid beforeClass() {
        Configuration configuration = new Configuration();


try {
            configuration.configure();
        } catch (HibernateException e) {
// TODO Auto-generated catch block
            e.printStackTrace();
        }


        ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
        sessionFactory = configuration.buildSessionFactory(serviceRegistry);
    }
@SuppressWarnings("unchecked")
@Test
publicvoid testListEhcache() {
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        List<User> users1 = (List<User>)session.createQuery("from User").setCacheable(true).list();
for(User user : users1) {
            System.out.println(user.getName());
        }
        session.getTransaction().commit();
        session.close();

        Session session2 = sessionFactory.openSession();
        session2.beginTransaction();
        List<User> users2 = (List<User>)session2.createQuery("from User").setCacheable(true).list();
for(User user : users2) {
            System.out.println(user.getName());
        }
        session2.getTransaction().commit();
        session2.close();
    }
}

输出结果：

Hibernate: select user0_.id as id1_0_, user0_.age as age2_0_, user0_.name as name3_0_ from User user0_
zhangsan
zhangsan
lisi
wangwu
zhangsan
zhangsan
lisi
wangwu

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